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How much RAM do you have allocated? Try between 2-5GB, this will require x64 version of Java. Provided the link just in case you think you do, but have 32bit. I've seen that happen way too often not to provide it just in case. Also try adding these arguments.
i have 2gb and https://www.java.com/en/download/manual.jsp than i chose windows offline 64 bit[DOUBLEPOST=1391896994][/DOUBLEPOST]i also tried the ftb launcher section of those arguments
Ensure that you do not have any Global Arguments that are limiting it to say 512M. Check here for the instructions for windows 7 to check. Windows 8, if you have it, should be in a similar place.